feat(elements): add elements_getunblindedurl endpoint #360
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Add new function to construct Liquid explorer URLs with unblinding data.
The function:
- Takes txid and optional base_url as parameters
- Calls gettransaction to retrieve transaction with blinding factors
- Extracts amountblinder, assetblinder, asset, and amount from details
- Filters out entries with zero blinders (unblinded outputs)
- Converts amounts from BTC to satoshis
- Constructs URL with #blinded= fragment containing comma-separated
blinding data for each output
URL format:
{base_url}/tx/{txid}#blinded={amount},{asset},{amountblinder},{assetblinder},...
Returns JSON: {"url": "...", "txid": "..."}
Closes #359
Register the new endpoint in requesthandler.sh to expose the
elements_getunblindedurl function via HTTP.
Endpoint: GET /elements_getunblindedurl/{txid}[/{base_url}]
The base_url parameter is URL-encoded and decoded in the handler
to support URLs like https://liquid.bullbitcoin.com
Part of #359
Grant watcher-level access to the new endpoint since it only reads transaction data and doesn't perform any spending operations. Part of #359
Security fix: Validate txid parameter before processing to prevent potential injection or malformed input issues. - Checks txid is not empty - Validates txid is exactly 64 hexadecimal characters - Returns proper error JSON if validation fails Code review fix for PR #360
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- Add liquid_explorer_url property to schema (required when elements enabled) - Add prompt in elements prompter for explorer URL - Add LIQUID_EXPLORER_URL to proxy.env template - Update elements_getunblindedurl to use env var instead of parameter - Simplify endpoint to only take txid (base_url from config)
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Summary
Add new Cyphernode endpoint to construct Liquid explorer URLs with unblinded transaction data.
Changes
elements_getunblindedurl()function toelements_blockchainrpc.shrequesthandler.shapi.propertiesEndpoint
Response:
{ "url": "https://liquid.network/tx/{txid}#blinded={amount},{asset},{amountblinder},{assetblinder},...", "txid": "{txid}" }URL Format
The
#blinded=fragment contains comma-separated values for each output:Multiple outputs are concatenated with commas.
Implementation Details
gettransactionRPC on spender node to get blinding dataRelated